On 27 Sep 2015 at 10:44, "Tóth Attila" wrote: > I've been seeing radeon related crashes upon boot on my laptop for a while > now, but I could just recently capture this Oops, which can be related. If > the machine hard-locks on boot, I can capture no messages. It looks, that > most of the time it can regenerate from that state somehow and continues > on without any problems. There was a kernel version months before, for > which boot resulted in a hard-lock each time. It happens once in every > couple of startups only. > > It's a null pointer dereference. Where should I report that?
to upstream kernel maintainers ;). but before you do that, enable frame pointers to get a better backtrace and also DEBUG_INFO so that addr2line can produce a precise location for the null deref. > I'm still having early-boot intel-iommu traces on my other machine, but > without any symptoms. Might be related to a 3ware card, fully functioning, > housing the system - therefore I cannot verify... twa_interrupt is from the 3ware 9xxx driver and it seems that it wants to unmap a page it doesn't own. DEBUG_INFO and addr2line would help to identify the bad call in twa_interrupt (ffffffff9f77d78e in the below trace) then you can send it upstream ;). > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 0 at drivers/iommu/intel-iommu.c:3214 > intel_unmap+0x146/0x200() > Driver unmaps unmatched page at PFN 0 > Modules linked in: > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.1.7-hardened-r1 #1 > Hardware name: System manufacturer System Product Name/Z8P(N)E-D12(X), > BIOS 1302 06/25/2012 > 0000000000000000 0bf0f1830deb9167 ffffffffa61a1f87 0000000000000000 > ffffffffa61a1f87 ffffffff9fe5d48d ffff880237c03d80 ffffffff9f0a96e7 > ffffffffa61a1f87 0000000000000c8e ffffffffa61e1500 ffff880433ceb368 > Call Trace: > <IRQ> [<ffffffff9fe5d48d>] ? dump_stack+0x40/0x56 > [<ffffffff9f0a96e7>] ? warn_slowpath_common+0x77/0xb0 > [<ffffffff9f0a978c>] ? warn_slowpath_fmt+0x6c/0x90 > [<ffffffff9f6aa8e6>] ? intel_unmap+0x146/0x200 > [<ffffffff9f77d78e>] ? twa_interrupt+0x48e/0x780 > [<ffffffff9f0f9de3>] ? handle_irq_event_percpu+0x73/0x120 > [<ffffffff9f0f9ec0>] ? handle_irq_event+0x30/0x50 > [<ffffffff9f0fcfd8>] ? handle_fasteoi_irq+0x88/0x180 > [<ffffffff9f005385>] ? handle_irq+0x85/0x160 > [<ffffffff9f0ce264>] ? atomic_notifier_call_chain+0x24/0x30 > [<ffffffff9f004c01>] ? do_IRQ+0x41/0xf0 > [<ffffffff9fe69397>] ? common_interrupt+0x97/0x97
